EFFECT OF GROUND PERMEABILITY 



477 



sin Ad 



sin 80 



+ 



vui rx 



6!7 



-^ ) sin na 



+ 



+ 



<iV 



Yx COS B , ^i''' COR 3/? ^i^ COS 50 



Wi :; h "';i T^T^ " — ^'5 



325 



?;/7 



3-5.27 

 r^ COS 70 + + 

 3252729 



, 1 // , 1 2\ r,4cos40/, . , 2 

 ri^ cos 80 / 2 \ 



+ -i^i!5r(v^^ + '"^'^*^^ 7;; - + •••' 



where ri = ^/Vm = V47rXa)|_.T2 _|_ (^/^ _|_ yj2] = Carson's r and the per- 

 meabihty is contained in the functions ni:, and l^. 



The definitions of the nu and /r will be found in Appendix II. The 

 table of numerical values should suffice for most needs. 



TA?iLE 1 



